| Computer Code: |
LAGS |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Turonian Age (KT)
— Turonian Age (KT) |
| Lithological Description: |
Medium- to coarse-grained poorly sorted sandstones and conglomerates. |
| Definition of Lower Boundary: |
The lower boundary is unconformable on the Gribun Chalk Formation but the formation is considered to be absent in Mull and Morvern by Mortimore, Wood and Gallois (2001). This member is the basal unit of the Strathaird Limestone Formation according to Braley (1990). |
| Definition of Upper Boundary: |
The upper boundary is disconformable (at an erosion surface above a coarse very poorly sorted conglomerate) with the grey micritic limestones of the remainder of the Strathaird Limestone Formation (the Laig Gorge Limestone Member) at Strathaird on Skye and at a burrowed surface with the same limestones at Laig Gorge on Eigg. |
| Thickness: |
3.0m at Laig Gorge, Eigg. |
| Geographical Limits: |
Known on the islands of Eigg and Skye. |
| Parent Unit: |
Strathaird Limestone Formation (STRL)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
Laig Gorge on Eigg. See Emeleus, 1997, 35-36. |
| Reference Section |
Strathaird on Skye. Where 0.44m of the top of the member is seen below the Laig Gorge Limestone Member. |
| Reference(s): |
| Lowden, B, Braley, S, Hurst, A and Lewis, J, 1992. Sedimentological studies of the Cretaceous Lochaline Sandstone, NW Scotland. 159-162 in Parnell, J (editor), Basins on the Atlantic Seaboard: Petroleum Geology, Sedimentology and Basin Evolution. Geological Society of London Special Publication, No.62. |
| Braley, S M. 1990. The Sedimentology, Palaeoecology and Stratigraphy of Cretaceous Rocks in N.W. Scotland. Unpublished PhD Thesis CNAA, Polytechnic SouthWest (now University), Plymouth. |
| Emeleus, C H. 1997. Geology of Rum and the adjacent islands. Memoir (sheet) of the Geological Survey of Great Britain (Scotland) (60). (The Stationery Office for the British Geological Survey.) 171pp. |
| Mortimore, R N, Wood, C J and Gallois, R W, 2001. British Upper Cretaceous Stratigraphy. Geological Conservation Review Series. No. 23. (Peterborough: Joint Nature Conservation Committee.) |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
